126989 has 2 divisors, whose sum is σ = 126990. Its totient is φ = 126988.

The previous prime is 126967. The next prime is 127031. The reversal of 126989 is 989621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 122500 + 4489 = 350^2 + 67^2 .

It is a cyclic number.

It is not a de Polignac number, because 126989 - 2⁸ = 126733 is a prime.

It is a super-2 number, since 2×126989² = 32252412242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (126949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63494 + 63495.

It is an arithmetic number, because the mean of its divisors is an integer number (63495).

2¹²⁶⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

126989 is a deficient number, since it is larger than the sum of its proper divisors (1).

126989 is an equidigital number, since it uses as much as digits as its factorization.

126989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7776, while the sum is 35.

The square root of 126989 is about 356.3551599177. The cubic root of 126989 is about 50.2638056833.

The spelling of 126989 in words is "one hundred twenty-six thousand, nine hundred eighty-nine".